lkml.org 
[lkml]   [2015]   [Apr]   [9]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
SubjectRe: [PATCH] PPS: Restore lost capture-clear option to pps-gpio module.
From
Date
Hi Gary,

On Do, 2015-04-02 at 12:21 -0700, Gary E. Miller wrote:
> In the conversion from platform to device tree the capture-clear
> option was lost.
>
> capture-clear is needed so that time_pps_fetch() will report both
> edges of each PPS pulse. Both edges are needed so that userland
> programs, like gpsd, can autodetect the leading and trailing PPS
> edges.

This is intentional. The userspace program can configure which edges it
wants to capture at runtime. Only the polarity (assert-falling-edge) is
actually determined by the hardware and must be described in the device
tree.

Regards,
Jan
--
Pengutronix e.K. | |
Industrial Linux Solutions | http://www.pengutronix.de/ |
Peiner Str. 6-8, 31137 Hildesheim, Germany | Phone: +49-5121-206917-0 |
Amtsgericht Hildesheim, HRA 2686 | Fax: +49-5121-206917-5555 |



\
 
 \ /
  Last update: 2015-04-09 15:41    [W:0.119 / U:9.716 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site